Low Frequency Inverter With 12v 24v

FT series low frequency inverter with 12v 24v

First, the fundamental principle of the current sense resistor:

    According to Ohm's law, when the measured current flows through the resistor, the voltage across the resistor is proportional to the current. When the current through the 1W resistor is several hundred mA, this design is no problem. However, if the current reaches 10- 20A, the situation is completely different, because the power lost on the resistor (P=I2xR) cannot be ignored. We can reduce the power loss by reducing the resistance value of the resistor, but the voltage at both ends of the resistor will also decrease accordingly, so according to the sampling resolution Considering the rate, the resistance value of the resistor is not allowed to be too low.

Second, long-term stability

    Long-term stability is very important for any sensor. Even after a few years of use, it is expected to maintain the previous accuracy. This means that the resistance data must be corrosion resistant during the life cycle, and the alloy composition must be Can not be changed. To make the measuring element meet these requirements, an alloy composed of homogenous composite crystals can be used, and the production process of annealing and stabilization treatment can be used to reach the basic thermodynamic state. The stabilization work of such an alloy can reach the order of ppm/year, so that it can be used to gauge resistors.

   Surface mount resistors only have a slight drift of about -0.2% after aging at 140°C for 1000 hours, which is caused by lattice defects caused by slight deformation during the production process. The resistance drift is largely determined by high temperature , so at a lower temperature, such as +100 °C, this drift is practically undetectable.

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